CN113165487A

CN113165487A - Equipment supporting device

Info

Publication number: CN113165487A
Application number: CN201980077767.5A
Authority: CN
Inventors: G·尚特尔
Original assignee: Audi AG
Current assignee: Audi AG
Priority date: 2018-11-30
Filing date: 2019-11-07
Publication date: 2021-07-23
Anticipated expiration: 2039-11-07
Also published as: US20210379976A1; DE102018220728B4; EP3887186B1; CN113165487B; DE102018220728A1; WO2020108946A1; EP3887186A1; US11912118B2

Abstract

The invention relates to a device support device (10) for a power device (12) of an electric vehicle, which has at least a first device support (34, 36) and a second device support (35, 38), the A first equipment support and a second equipment support are arranged on the subframe (14) spaced apart from each other in the vehicle transverse direction (y), wherein the equipment supports (34, 35, 36, 38) are each supported by the equipment The parts (40, 46, 48) support the power equipment (12), the invention is characterized in that the first equipment supports (34, 36) and the second equipment supports (35, 38) are arranged asymmetrically with each other in the auxiliary vehicle on the beams (24, 30) of the frame (14).

Description

Equipment supporting device

Technical Field

The present invention relates to a device carrier for a power unit of an electric vehicle of the type stated in the preamble of claim 1.

Background

The drive unit of an electric vehicle is usually arranged in the region of one or more axles between the drive wheels and is supported on a support structure of the vehicle body by means of vibration-damped unit supports and unit supports, which in part have material-intensive support arms extending over a large lever arm length. In particular, the drive unit can be mounted on a subframe which forms the connection between the drive unit and the vehicle body.

In the case of the equipment carrier, there is basically a conflict of objectives in the adaptation of the equipment carrier with regard to the input of vibrations and structure-borne noise into the vehicle body. The vibrations are reduced by the support being as rigid as possible, whereas the structure-borne sound input is reduced by the flexible support.

For structural reasons, three points on the power plant are suitable for connecting the power plant, so that the power plant is usually supported by means of a statically determined three-point bearing. The problem with three-point bearings is that only a small vibration damping can be achieved for the power plant due to the few bearing points, which leads to a reduction in the comfort which increases with the vibrations.

In order to achieve a higher damping, the power plant can also be supported by a four-point bearing, for example by two front plant bearing devices and two rear plant bearing devices. The four-point bearing arrangement achieves a higher level of comfort in the chassis and a better acoustic isolation of the motor/gear unit with increased engine output and the associated high torques of the drive train, since each bearing carries a lower load. The design of the power plant results in three rigid structures which are suitable as power plant-side connection points due to their proximity to the subframe. However, the fourth connection point must be reinforced by a longer device-side bracket, which however leads to an increase in weight.

DE 102012012327 a1 discloses an electric motor unit arranged in a vehicle. The motor unit is fastened to the vehicle body and to the axle carrier by means of at least two device carriers. The device carrier fastened on the axle carrier side is connected to the power device (or the electric motor unit) via a motor bracket. One of the equipment supports is fastened to the motor cover/housing of the electric motor unit, while the other equipment support is fixed to the transmission housing.

DE 102015016390 a1 discloses a device bearing arrangement in which an electric motor is mounted on a subframe via a four-point bearing. For this purpose, a front equipment carrier is formed on the front node element of the subframe and a rear equipment carrier is formed on the rear node element, which are each screwed to an equipment carrier.

Disclosure of Invention

The object of the present invention is to improve a device carrier of the type mentioned in the preamble of claim 1 in such a way that a weight-saving optimization of the connection of the power plant is achieved.

Device mounting devices for a power unit of an electric vehicle are known which comprise at least a first device carrier and a second device carrier, wherein the device carriers are arranged on a subframe at a distance from one another in the transverse direction of the vehicle and each support the power unit via a device support.

The drive unit is designed, for example, as an electric machine, which comprises an electric motor, a transmission and a differential. For vibration damping, the drive unit is mounted on the subframe via vibration-damping unit mounts with intermediate connection of the unit mounts. At least one first and one second device carrier are arranged on the subframe at a distance from one another in the transverse direction of the vehicle, wherein the subframe has laterally two longitudinal beams arranged in the longitudinal direction of the vehicle, which are connected to one another at their front and rear node elements by a transverse beam. The subframe serves as a connection between the power plant and the vehicle body.

Depending on the design, the drive unit has two suitable connection points on the housing of the transmission, which are located in the vicinity of in each case one transverse member of the subframe, depending on the design of the drive unit and the arrangement of the electric motor and the differential relative to one another. The connection points on the transmission housing are each supported on the subframe via a first device carrier and a second device carrier spaced apart from the first device carrier in the transverse direction of the vehicle.

The housing of the differential and the housing of the electric motor are arranged at the respective other cross member. The two housings each have a suitable connection point, as a result of the design, wherein the housing of the differential is mounted close to the subframe via a first device carrier on the subframe and the housing of the electric motor is mounted on the subframe via a second device carrier spaced apart from the first device carrier in the transverse direction of the vehicle. The connection point on the housing of the differential is arranged close to the subframe on the first device carrier, while the connection point of the motor housing is at a greater distance from the subframe. The second equipment carrier usually supports the power equipment, in particular the electric motor, on the subframe in a vibration-proof manner with the interposition of a material-intensive equipment support.

According to the invention, the first and second equipment supports are arranged asymmetrically to one another on the cross member of the subframe. Depending on the embodiment of the electric motor and depending on the mutual arrangement of the motor and the differential, the first and second device carrier are designed asymmetrically either on the front cross member or on the rear cross member. In particular, the second equipment carrier, independently of the symmetrical arrangement with respect to the first equipment carrier, is arranged on the subframe in such a way that it has the shortest possible distance to the respective drive-side connection point to be supported. In this way, a material-intensive reinforcement of the respective connection point, for example by a device support designed with a long lever arm, which leads to an increase in weight at the bearing point, is advantageously avoided.

According to a preferred embodiment, the first equipment carrier and the second equipment carrier are arranged asymmetrically in the longitudinal direction of the vehicle on the front cross member of the subframe. According to an embodiment of the electric motor and the mutual arrangement of the motor and the differential, the electric motor and the differential are arranged on a front cross beam of the subframe, wherein the connection point of the differential is arranged on the front cross beam close to the subframe, as opposed to the connection point of the motor. The second equipment support is arranged asymmetrically with respect to the first equipment support on the subframe. The second device carrier is thus at the shortest possible distance from the respective drive-side connection point to be supported on the motor housing. In an advantageous manner, material-intensive strengthening of the respective connecting points, for example by means of a device support constructed with a long lever arm, which leads to an increase in weight at the bearing point, can be avoided.

According to an alternative embodiment, the first and second device carrier are arranged asymmetrically in the longitudinal direction of the vehicle at the rear transverse member of the subframe. According to an embodiment of the electric motor and the mutual arrangement of the motor and the differential, the electric motor and the differential are arranged at a rear cross beam of the subframe, wherein the connection point of the differential is arranged close to the subframe on the rear cross beam, opposite to the connection point of the motor. The asymmetrical arrangement of the second device carrier relative to the first device carrier makes it possible to achieve a short distance between the second device carrier and the respective drive-side connection point to be supported on the motor housing. In an advantageous manner, a material-intensive stiffening of the respective connecting point, for example by means of a device support constructed with a long lever arm, which leads to an increase in weight at the bearing point, can thereby be avoided.

According to a preferred embodiment, the first and second asymmetrical device carrier each have a bearing axis, wherein the respective bearing axes, starting from any center point, are arranged offset from one another in the vertical direction of the vehicle and in the longitudinal direction of the vehicle. By means of the bearing axes vertically offset from one another, it is possible to achieve that the asymmetrical first and second device carrier take up correspondingly different height positions on the subframe depending on their respective bearing characteristic curve and the position of the center of gravity of the power unit. The two asymmetrical device supports thus provide a better distributed bearing surface and greater stability in the event of a weight shift (Gewichtsverlagerung) of the power plant than the conventional symmetrical arrangement of the respective device supports.

By means of the bearing axes offset horizontally and vertically with respect to one another, both the asymmetrical first device carrier and the second device carrier can be positioned in the vicinity of a given rigid connection of the power plant. In particular, the second device support is located in the immediate vicinity of the respective connection point on the motor housing of the power unit, which enables a rigid connection of the power unit without the need for intermediate connection material-intensive device supports, which lead to a significant increase in weight.

The cross member preferably has a first support receiver and a second support receiver for receiving the first and second asymmetric device supports, respectively. The cross member provides a rigid face on which the two bearing receivers can be positioned. Thereby, the respective device support can be inserted rigidly into the support receptacle.

Preferably, the first bearing receptacle and the second bearing receptacle are each arranged at an end region of the crossmember. The subframe has two lateral longitudinal members which are connected at the front and rear joint elements by a front transverse member and a rear transverse member, respectively. The corner regions of the subframe have high component stiffness. In an advantageous manner, the support receptacle arranged at the component-rigid end region of the cross member enables an asymmetrical rigid arrangement of the first and second device supports.

Preferably, the drive unit is supported on the rear cross member of the subframe and/or on the rear joint element via two rear unit supports. The subframe serves to connect the power unit to the body structure, wherein the power unit is supported by four approximately identically designed unit supports having a similar rigidity. In comparison with conventional three-point mounted machine supports, the four machine supports each have a lower weight load, since the bearing surfaces of the power machine are better distributed. This makes it possible to use a softer device carrier in order to be able to achieve better support coordination with respect to vibrations and structure-borne sound input. By means of the device support according to the invention, a higher damping of vibrations can be achieved, which results in a higher comfort.

Preferably, the rear cross member and/or the rear node element of the subframe have bearing receptacles for receiving rear equipment supports. In order to increase the rigidity of the component, it is proposed that the rear bearing receptacle be arranged on the cross member close to a rigid corner of the subframe and/or on a node element having a high rigidity.

In an alternative embodiment, the drive unit is supported on the front cross member and/or the front node element of the subframe via two front unit supports. The power plant is thus supported with similar stiffness by four approximately identically constructed plant supports, which have a lower weight load than conventional three-point-supported plant supports due to their better distributed bearing surface. The device carrier according to the invention results in a higher vibration damping and a higher comfort, since softer device supports can be used, which enable a better support coordination with respect to vibrations and structure-borne sound input.

The front cross member and/or the front node element of the subframe preferably have a support receptacle for receiving a front equipment support. In order to increase the rigidity of the component, it is proposed that the front support receiver be arranged on the cross member close to a rigid corner of the subframe and/or on a node element having a high rigidity.

According to one embodiment, the bearing receptacle is formed integrally with the subframe. The subframe including the bearing receivers can be made, for example, from a casting. This enables inexpensive mass production.

According to an alternative embodiment, the bearing receptacle is designed as a component preassembled on the subframe. It is conceivable for the bearing mount receptacles to be screwed and/or welded to the subframe. Thereby, a flexible configuration of the arrangement of the bearing receptacles is achieved.

Drawings

Further advantages and application possibilities of the invention are given by the following description of an embodiment thereof in connection with the drawings.

Shown in the drawings are:

fig. 1 shows a perspective view of a device carrier according to the invention of a power plant, which is mounted on a subframe, from an oblique top;

fig. 2 shows a schematic view of a device support according to the invention of a power device from above; and

fig. 3 shows a view of the device carrier according to the invention, with the subframe shown but without the power unit.

Detailed Description

Fig. 1 to 3 show a device support arrangement, generally designated by reference numeral 10, for a power plant of an electric vehicle.

Fig. 1 shows a perspective schematic view of a device carrier 10 according to the invention of a power unit 12, which is mounted on a subframe 14 in the form of a four-point bearing. The power plant 12, which is shown here for the sake of illustration and for easier understanding, is designed as an electric machine 25, which comprises an electric motor 16, a transmission 18 and a differential 20.

In the longitudinal direction x of the vehicle, the subframe 14 has two lateral joint elements 22 at the front, which are connected to one another by a front cross member 24. The two front node elements 22 are extended rearward in the vehicle longitudinal direction x by lateral longitudinal members 26. The longitudinal beams merge with a rear transverse beam 30 at a rear joint element 28.

In the present case, in each case one

inter-bearing receptacle

32, 33 is provided on the rear node element 28 for receiving a

rear equipment support

34, 35, in each case, the two rear equipment supports 34, 35 lying approximately in the same height plane. The drive unit 12 has two rigid connection points on the housing of the transmission 18, which are supported on the subframe 14 by rear unit supports.

A first device carrier 36 and a second device carrier 38 are arranged on the front cross member 24. In the vehicle longitudinal direction x, the differential 20 of the drive unit 12 is supported at the front by the first unit carrier 36 with the unit carrier 40 being connected in between. The housing of the electric motor 16, which is supported on the subframe 14 via the second front subframe 38, is at a greater distance from the subframe 14 than the housing of the differential 20.

In accordance with the present invention, the second forward equipment support 38 is asymmetrically disposed with respect to the first equipment support 36. In particular, the two front equipment supports 36, 38 are arranged offset from one another in the vehicle vertical direction z and in the vehicle longitudinal direction y on the subframe 14. By means of the bearing axes a of the two

equipment carrier parts

36, 38, which are vertically offset from one another, it is achieved that the first equipment carrier part 36 and the second equipment carrier part 38 occupy respectively different height positions on the subframe 14 as a function of their respective bearing characteristic curves and the position of the center of gravity of the power unit 12.

The front cross member 24 in this case provides a mounting surface at its rigid end region for the arrangement of the

support receptacles

42, 44, in which the first and second device supports 36, 38 are each received. In the mounted state of the subframe 14, the first bearing receptacle 42 rests on an upwardly directed face of the transverse beam 24, while the second bearing receptacle 44 is advantageously positioned on the rear side of the front transverse beam 24 in the direction of the power unit 12. Thus, the two forward asymmetric equipment supports 36, 38 provide a better distributed bearing surface and greater stability when the weight of the power plant 12 shifts as compared to the conventional symmetric arrangement of the forward equipment supports 36, 38.

Due to the different vertical and horizontal arrangement of the

respective support receptacles

42, 44 on the subframe 14, the respective support axes a of the inserted asymmetrical first and second device supports 36, 38 are arranged offset from one another in the vehicle vertical direction z and in the vehicle longitudinal direction y. The bearing axis a of the first device carrier 36 is aligned with the direction of extension of the transverse member 24 and is arranged above the transverse member 24 in the vertical direction z of the vehicle. The bearing axis a of the second equipment support 38 is almost at the same vertical level as the cross beam 24. In the vertical direction z of the vehicle, the bearing axis of the second equipment support lies substantially in the plane of the transverse beam 24.

The second bearing receptacle 44 is arranged at the transverse member 24 in a space-saving manner such that the inserted second device bearing 38 is positioned close to the drive side at the connection of the housing of the motor 16. This avoids the weight-increasing stiffening of the second device carrier 38 by the material-intensive device carrier 46.

Fig. 2 shows the device carrier 10 according to the invention with a power unit 12 on a subframe 14 from above. The subframe 14 comprises laterally two longitudinal members 26, which are arranged in the longitudinal direction x of the vehicle and which are connected to one another at a front joint element 22 and a rear joint element 28 with

transverse members

24, 30, respectively. The symmetrical arrangement of the two rear equipment supports 34, 35, which are arranged at a distance from one another in the transverse direction y of the vehicle on the subframe 14, can be clearly seen. The equipment supports 48 arranged above the rear equipment supports 34, 35 are connected to connection points of the housing of the transmission 18, respectively.

The two front equipment supports 36, 38 are inserted into

support receptacles

42, 44 on the front cross member 24 of the subframe 14. With the

respective device carrier

40, 46 connected in between, the first device carrier 36 supports the housing of the differential 20 on the subframe 14, while the second device carrier 38 is connected to the connection point of the housing of the motor 16.

Here, the front cross member 24 is drawn/deep-drawn into a flange 50 in the direction of the power unit 12. This allows the subframe 14 to engage the second equipment support 38 such that the second equipment support is disposed closer to the rigid attachment point of the power equipment 12. The bearing receptacle 44 of the second device bearing 38 is supported on the deep-drawn collar 50. The flange 50 is formed on one side of the front cross member 24 in order to serve in its sufficiently large area as a local reinforcement for the second device carrier 38. This avoids a material-intensive and weight-increasing device support 46 on the second device support 38.

In addition, the subframe 14 may compensate for weight transfer due to asymmetry of the front equipment supports 36, 38. This compensation of the weight shift can be achieved on the subframe 14 by, for example, the subframe 14 having a deep-drawn flange 50 on the front cross member 24 as described above.

In fig. 3, the arrangement of the device carrier 10 according to the invention on the subframe 14 is shown without power equipment. The two rear-equipment supports 34, 35 are arranged on the subframe 14 at a distance from one another in the transverse direction y of the vehicle. In this case, the bearing

receptacles

32, 33 of the respective rear-

equipment carrier

34, 35 are arranged on the respective rear node element 28 of the subframe 14.

The

front equipment carrier

36, 38 is arranged asymmetrically spaced apart from one another on the front cross member 24, wherein the respective support axes a of the first equipment carrier 36 and the second equipment carrier 38 are arranged differently from one another in the vehicle vertical direction z and in the vehicle longitudinal direction x. This makes it possible in particular for the second equipment support 38 to be positioned as close as possible to the connection point of the power equipment 12 compared to conventional equipment supports. The connection stiffness of the bearing points is thereby increased, as a result of which the intermediate device support 46 can be formed with a smaller lever arm length and therefore with a smaller weight.

Claims

1. An equipment support device (10) for a power equipment (12) of an electric vehicle, comprising at least a first equipment support (34, 36) and a second equipment support (35, 38),

The first equipment support and the second equipment support are arranged on the subframe (14) spaced apart from each other in the vehicle transverse direction (y), wherein the equipment supports (34, 35, 36, 38) respectively pass through The equipment supports (40, 46, 48) support the power equipment (12),

It is characterized in that,

The first equipment supports (34, 36) and the second equipment supports (35, 38) are arranged asymmetrically to each other on the cross members (24, 30) of the subframe (14).

2. The equipment support device according to claim 1, characterized in that, in the vehicle longitudinal direction (x), the asymmetrical first equipment support (36) and the second equipment support (38) are arranged on the subframe (14) on the front cross member (24).

3. The equipment support device according to claim 1, characterized in that, in the vehicle longitudinal direction (x), the asymmetrical first equipment support (34) and the second equipment support (35) are arranged on the subframe (14) on the rear cross member (30).

4. Device support device according to claim 2 or 3, characterized in that the asymmetric first device support (36) and the second device support (38) each have a support axis (A), wherein, The individual bearing axes (A)—starting from an arbitrary center point—are arranged offset from one another in the vehicle vertical direction (z) and in the vehicle longitudinal direction (x).

5. Equipment support arrangement according to any one of the preceding claims, characterized in that the beams (24, 30) have a first equipment support (34, 36) and a second equipment support respectively for receiving asymmetrical The first support receivers (32, 42) and the second support receivers (33, 44) of the components (35, 38).

6. The equipment support device according to claim 5, characterized in that the first support member receiving portion (32, 42) and the second support member receiving portion (33, 44) are respectively arranged on the cross beams (24, 30) at the end area.

7 . The equipment support device according to claim 2 , wherein the power equipment ( 12 ) is supported behind the subframe ( 14 ) by means of two rear equipment supports ( 34 , 35 ). 8 . On the beam (30) and/or on the rear node element (28).

8 . The device support device according to claim 7 , wherein the rear cross member ( 30 ) and/or the rear node element ( 28 ) of the subframe ( 14 ) have a device support for respectively receiving the rear part. 9 . The support receptacles (32, 33) of the parts (34, 35).

9. The equipment support device according to claims 3 to 6, characterized in that the power equipment (12) is supported on the front cross member ( 24) and/or on the front node element (22).

10 . The equipment support device according to claim 9 , wherein the front cross member ( 24 ) and/or the front node element ( 22 ) of the subframe ( 14 ) have equipment supports for receiving the front part. 11 . Bearing receivers (42, 44) of (36, 38).

11. Equipment support device according to any one of claims 5 to 10, characterized in that the support receptacles (32, 33, 42, 44) are formed integrally with the subframe (14).

12. Device support device according to any of claims 5 to 10, characterized in that the support receptacles (32, 33, 42, 44) are designed to be pre-assembled on the subframe (14) components.